EP3509379B1 - Method for transmitting downlink control information in wireless communication system and device using same - Google Patents

Method for transmitting downlink control information in wireless communication system and device using same Download PDF

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Publication number
EP3509379B1
EP3509379B1 EP17847005.0A EP17847005A EP3509379B1 EP 3509379 B1 EP3509379 B1 EP 3509379B1 EP 17847005 A EP17847005 A EP 17847005A EP 3509379 B1 EP3509379 B1 EP 3509379B1
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EP
European Patent Office
Prior art keywords
dci format
size
dci
resource
sidelink
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EP17847005.0A
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German (de)
English (en)
French (fr)
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EP3509379A1 (en
EP3509379A4 (en
Inventor
Seungmin Lee
Hanbyul Seo
Hyukjin Chae
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H04L1/001—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H04L1/0008—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length by supplementing frame payload, e.g. with padding bits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0033—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation each allocating device acting autonomously, i.e. without negotiation with other allocating devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to wireless communications, and more particularly, relates to a method for transmitting downlink control information in a wireless communication system and an apparatus using the method.
  • ITU-R International Telecommunication Union Radio communication sector
  • IP Internet Protocol
  • 3GPP 3 rd Generation Partnership Project
  • 3GPP is a system standard to satisfy the requirements of IMT-Advanced and is preparing for LTE-Advanced improved from Long Term Evolution (LTE) based on Orthogonal Frequency Division Multiple Access (OFDMA)/Single Carrier-Frequency Division Multiple Access (SC-FDMA) transmission schemes.
  • LTE-Advanced is one of strong candidates for IMT-Advanced.
  • V2X refers to vehicle-to-everything communication and includes V2V, that is, vehicle-to-vehicle communication.
  • a base station schedules a resource for V2V communication.
  • a BS transmits a new type of downlink control information for V2V communication to a user equipment (UE).
  • UE user equipment
  • a method for configuring downlink control information for V2V communication is need which is capable of minimizing an increase in the number of times of blind decoding by a UE without considerably increasing complexity.
  • WO 2016/114560 A1 discloses a method whereby UE transmits capability information in a wireless communication system.
  • the method comprises: generating UE capability information indicating the capability of the UE; and transmitting the UE capability information to a base station, wherein the UE capability information includes blind decoding capability information indicating the number of times the UE can perform blind decoding on a downlink control channel in one subframe.
  • 3GPP document R1-166223 titled "Introduction of V2V into TS36.212 (skeleton) " is a draft change request to TS 36.212 to include a Rel-14 feature for V2V.
  • WO 2016/028059 A1 discloses a method for transmitting and receiving data in a wireless communication system supporting device-to-device (D2D) communication.
  • the method performed by a first terminal comprises the steps of: receiving, from a base station, a resource pool for use in D2D communication, the resource pool including at least one of a scheduling assignment (SA) resource pool indicating a resource region where SA is transmitted, and a data resource pool indicating a resource region where D2D data are transmitted; transmitting SA including information relating to D2D data transmission, to a second terminal through the SA resource pool; and transmitting D2D data to the second terminal.
  • SA scheduling assignment
  • WO 2016/165124 A1 discloses a method for allocating radio resources for a transmitting user equipment to perform direct communication transmissions over a direct sidelink connection to one or more receiving user equipments.
  • At least two sidelink grant processes are provided in the transmitting user equipment for the transmitting UE to handle at least two sidelink grants within the same transmission control period.
  • Each one of the sidelink grant processes is associated with an identification and can be associated with one sidelink grant.
  • the transmitting UE acquires at least two sidelink grants and associates each of the acquired sidelink grants with one sidelink grant process.
  • the transmitting UE allocates radio resources according to the respective sidelink grant to perform a direct communication transmission of sidelink control information and of data over the direct sidelink connection.
  • the transmitting UE performs a direct communication transmission per acquired sidelink grant within the same transmission control period.
  • the document discloses that, if the number of information bits in DCI format 5 mapped onto a given search space is less than the payload size of format 0 for scheduling the same serving cell, zeros shall be appended to format 5 until the payload size equals that of format 0 including any padding bits appended to format 0.
  • 3GPP document R1-168224 a change request, discloses that if the number of information bits in format 5 mapped onto a given search space is less than the payload size of format 0 for scheduling the same serving cell, zeros shall be appended to format 5 until the payload size equals that of format 0 including any padding bits appended to format 0.
  • downlink control information for V2V communication it is possible to prevent complexity in UE implementing V2X communication from being considerably increased. For example, it is possible to minimize or prevent an increase in the number of times of blind decoding by a UE for detecting downlink control information for V2X communication.
  • FIG. 1 shows a wireless communication system
  • the wireless communication system may be referred to as an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN) or a Long Term Evolution (LTE)/LTE-A system, for example.
  • E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution
  • the E-UTRAN includes at least one base station (BS) 20 which provides a control plane and a user plane to a user equipment (UE) 10.
  • the UE 10 may be fixed or mobile, and may be referred to as another terminology, such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc.
  • the BS 20 is generally a fixed station that communicates with the UE 10 and may be referred to as another terminology, such as an evolved node-B (eNB), a base transceiver system (BTS), an access point, etc.
  • eNB evolved node-B
  • BTS base transceiver system
  • access point etc.
  • the BSs 20 are interconnected by means of an X2 interface.
  • the BSs 20 are also connected by means of an S1 interface to an evolved packet core (EPC) 30, more specifically, to a mobility management entity (MME) through S1-MME and to a serving gateway (S-GW) through S1-U.
  • EPC evolved packet core
  • MME mobility management entity
  • S-GW serving gateway
  • the EPC 30 includes an MME, an S-GW, and a packet data network-gateway (P-GW).
  • the MME has access information of the UE or capability information of the UE, and such information is generally used for mobility management of the UE.
  • the S-GW is a gateway having an E-UTRAN as an end point.
  • the P-GW is a gateway having a PDN as an end point.
  • Layers of a radio interface protocol between the UE and the network can be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the open system interconnection (OSI) model that is well-known in the communication system.
  • a physical (PHY) layer belonging to the first layer provides an information transfer service by using a physical channel
  • a radio resource control (RRC) layer belonging to the third layer serves to control a radio resource between the UE and the network.
  • the RRC layer exchanges an RRC message between the UE and the BS.
  • FIG. 2 is a diagram showing a wireless protocol architecture for a user plane.
  • FIG. 3 is a diagram showing a wireless protocol architecture for a control plane.
  • the user plane is a protocol stack for user data transmission.
  • the control plane is a protocol stack for control signal transmission.
  • a PHY layer provides an upper layer with an information transfer service through a physical channel.
  • the PHY layer is connected to a medium access control (MAC) layer which is an upper layer of the PHY layer through a transport channel.
  • MAC medium access control
  • Data is transferred between the MAC layer and the PHY layer through the transport channel.
  • the transport channel is classified according to how and with what characteristics data is transferred through a radio interface.
  • the physical channel may be modulated according to an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and use the time and frequency as radio resources.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the functions of the MAC layer include mapping between a logical channel and a transport channel and multiplexing and demultiplexing to a transport block that is provided through a physical channel on the transport channel of a MAC Service Data Unit (SDU) that belongs to a logical channel.
  • SDU MAC Service Data Unit
  • the MAC layer provides service to a Radio Link Control (RLC) layer through the logical channel.
  • RLC Radio Link Control
  • the functions of the RLC layer include the concatenation, segmentation, and reassembly of an RLC SDU.
  • QoS Quality of Service
  • RB Radio Bearer
  • the RLC layer provides three types of operation mode: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM).
  • TM Transparent Mode
  • UM Unacknowledged Mode
  • AM Acknowledged Mode
  • AM RLC provides error correction through an Automatic Repeat Request (ARQ).
  • ARQ Automatic Repeat Request
  • the RRC layer is defined only on the control plane.
  • the RRC layer is related to the configuration, reconfiguration, and release of radio bearers, and is responsible for control of logical channels, transport channels, and PHY channels.
  • An RB means a logical route that is provided by the first layer (PHY layer) and the second layers (MAC layer, the RLC layer, and the PDCP layer) in order to transfer data between UE and a network.
  • the function of a Packet Data Convergence Protocol (PDCP) layer on the user plane includes the transfer of user data and header compression and ciphering.
  • the function of the PDCP layer on the user plane further includes the transfer and encryption/integrity protection of control plane data.
  • PDCP Packet Data Convergence Protocol
  • What an RB is configured means a process of defining the characteristics of a wireless protocol layer and channels in order to provide specific service and configuring each detailed parameter and operating method.
  • An RB can be divided into two types of a Signaling RB (SRB) and a Data RB (DRB).
  • SRB Signaling RB
  • DRB Data RB
  • the SRB is used as a passage through which an RRC message is transmitted on the control plane
  • the DRB is used as a passage through which user data is transmitted on the user plane.
  • the UE If RRC connection is established between the RRC layer of UE and the RRC layer of an E-UTRAN, the UE is in the RRC connected state. If not, the UE is in the RRC idle state.
  • a downlink transport channel through which data is transmitted from a network to UE includes a broadcast channel (BCH) through which system information is transmitted and a downlink shared channel (SCH) through which user traffic or control messages are transmitted. Traffic or a control message for downlink multicast or broadcast service may be transmitted through the downlink SCH, or may be transmitted through an additional downlink multicast channel (MCH).
  • BCH broadcast channel
  • SCH downlink shared channel
  • Traffic or a control message for downlink multicast or broadcast service may be transmitted through the downlink SCH, or may be transmitted through an additional downlink multicast channel (MCH).
  • MCH downlink multicast channel
  • an uplink transport channel through which data is transmitted from UE to a network includes a random access channel (RACH) through which an initial control message is transmitted and an uplink shared channel (SCH) through which user traffic or control messages are transmitted.
  • RACH random access channel
  • SCH uplink shared channel
  • Logical channels that are placed over the transport channel and that are mapped to the transport channel include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a multicast traffic channel (MTCH).
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH multicast traffic channel
  • the physical channel includes several OFDM symbols in the time domain and several subcarriers in the frequency domain.
  • One subframe includes a plurality of OFDM symbols in the time domain.
  • An RB is a resources allocation unit, and includes a plurality of OFDM symbols and a plurality of subcarriers.
  • each subframe may use specific subcarriers of specific OFDM symbols (e.g., the first OFDM symbol) of the corresponding subframe for a physical downlink control channel (PDCCH), that is, an L1/L2 control channel.
  • PDCCH physical downlink control channel
  • a Transmission Time Interval (TTI) is a unit time for subframe transmission.
  • the RRC state means whether or not the RRC layer of UE is logically connected to the RRC layer of the E-UTRAN.
  • a case where the RRC layer of UE is logically connected to the RRC layer of the E-UTRAN is referred to as an RRC connected state.
  • a case where the RRC layer of UE is not logically connected to the RRC layer of the E-UTRAN is referred to as an RRC idle state.
  • the E-UTRAN may check the existence of corresponding UE in the RRC connected state in each cell because the UE has RRC connection, so the UE may be effectively controlled.
  • the E-UTRAN is unable to check UE in the RRC idle state, and a Core Network (CN) manages UE in the RRC idle state in each tracking area, that is, the unit of an area greater than a cell. That is, the existence or non-existence of UE in the RRC idle state is checked only for each large area. Accordingly, the UE needs to shift to the RRC connected state in order to be provided with common mobile communication service, such as voice or data.
  • CN Core Network
  • the UE When a user first powers UE, the UE first searches for a proper cell and remains in the RRC idle state in the corresponding cell.
  • the UE in the RRC idle state establishes RRC connection with an E-UTRAN through an RRC connection procedure when it is necessary to set up the RRC connection, and shifts to the RRC connected state.
  • a case where UE in the RRC idle state needs to set up RRC connection includes several cases.
  • the cases may include a need to send uplink data for a reason, such as a call attempt by a user, and to send a response message as a response to a paging message received from an E-UTRAN.
  • a Non-Access Stratum (NAS) layer placed over the RRC layer performs functions, such as session management and mobility management.
  • functions such as session management and mobility management.
  • EMM-REGISTERED EPS Mobility Management-REGISTERED
  • EMM-DEREGISTERED EMM-DEREGISTERED
  • the two states are applied to UE and the MME.
  • UE is initially in the EMM-DEREGISTERED state.
  • the UE performs a process of registering it with the corresponding network through an initial attach procedure. If the attach procedure is successfully performed, the UE and the MME become the EMM-REGISTERED state.
  • an EPS Connection Management (ECM)-IDLE state In order to manage signaling connection between UE and the EPC, two types of states: an EPS Connection Management (ECM)-IDLE state and an ECM-CONNECTED state are defined.
  • the two states are applied to UE and the MME.
  • ECM-IDLE state When the UE in the ECM-IDLE state establishes RRC connection with the E-UTRAN, the UE becomes the ECM-CONNECTED state.
  • the MME in the ECM-IDLE state becomes the ECM-CONNECTED state when it establishes S1 connection with the E-UTRAN.
  • the E-UTRAN does not have information about the context of the UE.
  • the UE in the ECM-IDLE state performs procedures related to UE-based mobility, such as cell selection or cell reselection, without a need to receive a command from a network.
  • the mobility of the UE is managed in response to a command from a network. If the location of the UE in the ECM-IDLE state is different from a location known to the network, the UE informs the network of its corresponding location through a tracking area update procedure.
  • a D2D operation In 3GPP LTE-A, a service related to the D2D operation is referred to as a proximity-based service (ProSe).
  • ProSe a service related to the D2D operation
  • a ProSe is conceptually equivalent to a D2D operation and may be interchangeable with a D2D operation.
  • Sidelink communication may be referred to as different terms, such as D2D communication, ProSe direct communication, and ProSe communication.
  • Sidelink discovery may be referred to as different terms, such as D2D discovery, ProSe direct discovery, and ProSe discovery.
  • a D2D operation is performed between UEs, in which an interface between the UEs may be referred to as a sidelink.
  • a sidelink is a UE-to-UE interface for sidelink communication and sidelink discovery and corresponds to a PC5 interface.
  • the ProSe includes ProSe direction communication and ProSe direct discovery.
  • the ProSe direct communication is communication performed between two or more proximate UEs.
  • the UEs may perform communication by using a protocol of a user plane.
  • a ProSe-enabled UE implies a UE supporting a procedure related to a requirement of the ProSe.
  • the ProSe-enabled UE includes both of a public safety UE and a non-public safety UE.
  • the public safety UE is a UE supporting both of a function specified for a public safety and a ProSe procedure
  • the non-public safety UE is a UE supporting the ProSe procedure and not supporting the function specified for the public safety.
  • ProSe direct discovery is a process for discovering another ProSe-enabled UE adjacent to ProSe-enabled UE. In this case, only the capabilities of the two types of ProSe-enabled UE are used.
  • EPC-level ProSe discovery means a process for determining, by an EPC, whether the two types of ProSe-enabled UE are in proximity and notifying the two types of ProSe-enabled UE of the proximity.
  • the ProSe direct communication may be referred to as D2D communication
  • the ProSe direct discovery may be referred to as D2D discovery.
  • FIG. 4 shows a basic structure for ProSe.
  • the basic structure for ProSe includes an E-UTRAN, an EPC, a plurality of types of UE including a ProSe application program, a ProSe application server (a ProSe APP server), and a ProSe function.
  • the EPC represents an E-UTRAN core network configuration.
  • the EPC may include an MME, an S-GW, a P-GW, a policy and charging rules function (PCRF), a home subscriber server (HSS) and so on.
  • PCRF policy and charging rules function
  • HSS home subscriber server
  • the ProSe APP server is a user of a ProSe capability for producing an application function.
  • the ProSe APP server may communicate with an application program within UE.
  • the application program within UE may use a ProSe capability for producing an application function.
  • the ProSe function may include at least one of the followings, but is not necessarily limited thereto.
  • the D2D operation may be supported both when UE is serviced within the coverage of a network (cell) or when it is out of coverage of the network.
  • FIG. 5 shows the deployment examples of types of UE performing ProSe direct communication and cell coverage.
  • types of UE A and B may be placed outside cell coverage.
  • UE A may be placed within cell coverage
  • UE B may be placed outside cell coverage.
  • types of UE A and B may be placed within single cell coverage.
  • UE A may be placed within coverage of a first cell
  • UE B may be placed within coverage of a second cell.
  • ProSe direct communication may be performed between types of UE placed at various positions as in FIG. 5 .
  • At least one of the following two modes may be used for resource allocation for D2D communication.
  • Mode 1 is mode in which resources for ProSe direct communication are scheduled by an eNB.
  • UE needs to be in the RRC_CONNECTED state in order to send data in accordance with mode 1.
  • the UE requests a transmission resource from an eNB.
  • the eNB performs scheduling assignment and schedules resources for sending data.
  • the UE may send a scheduling request to the eNB and send a ProSe Buffer Status Report (BSR).
  • BSR ProSe Buffer Status Report
  • the eNB has data to be subjected to ProSe direct communication by the UE based on the ProSe BSR and determines that a resource for transmission is required.
  • Mode 2 is mode in which UE directly selects a resource.
  • UE directly selects a resource for ProSe direct communication in a resource pool.
  • the resource pool may be configured by a network or may have been previously determined.
  • the UE is considered to be placed within coverage of the eNB.
  • mode 2 may be applied. If the UE is placed within the coverage, the UE may use mode 1 or mode 2 depending on the configuration of an eNB.
  • UE may change mode from mode 1 to mode 2 or from mode 2 to mode 1.
  • D2D discovery refers to the procedure used in a ProSe capable terminal discovering other ProSe capable terminals in close proximity thereto and may be referred to as ProSe direct discovery.
  • the information used for ProSe direct discovery is hereinafter referred to as discovery information.
  • a PC 5 interface may be used for D2D discovery.
  • the PC 5 interface includes an MAC layer, a PHY layer, and a ProSe Protocol layer, that is, a higher layer.
  • the higher layer (the ProSe Protocol) handles the permission of the announcement and monitoring of discovery information.
  • the contents of the discovery information are transparent to an access stratum (AS).
  • the ProSe Protocol transfers only valid discovery information to the AS for announcement.
  • the MAC layer receives discovery information from the higher layer (the ProSe Protocol).
  • An IP layer is not used to send discovery information.
  • the MAC layer determines a resource used to announce discovery information received from the higher layer.
  • the MAC layer produces an MAC protocol data unit (PDU) for carrying discovery information and sends the MAC PDU to the physical layer.
  • An MAC header is not added.
  • the type 1 is a method for assigning a resource for announcing discovery information in a UE-not-specific manner.
  • An eNB provides a resource pool configuration for discovery information announcement to types of UE.
  • the configuration may be broadcasted through the SIB.
  • the configuration may be provided through a UE-specific RRC message. Or the configuration may be broadcasted through other than the RRC message in other layer or may be provided by UE-specific signaling.
  • the UE autonomously selects a resource from an indicated resource pool and announces discovery information using the selected resource.
  • the UE may announce the discovery information through a randomly selected resource during each discovery period.
  • the type 2 is a method for assigning a resource for announcing discovery information in a UE-specific manner.
  • UE in the RRC_CONNECTED state may request a resource for discovery signal announcement from an eNB through an RRC signal.
  • the eNB may announce a resource for discovery signal announcement through an RRC signal.
  • a resource for discovery signal monitoring may be assigned within a resource pool configured for types of UE.
  • An eNB 1) may announce a type 1 resource pool for discovery signal announcement to UE in the RRC_IDLE state through the SIB. Types of UE whose ProSe direct discovery has been permitted use the type 1 resource pool for discovery information announcement in the RRC_IDLE state.
  • the eNB 2) announces that the eNB supports ProSe direct discovery through the SIB, but may not provide a resource for discovery information announcement. In this case, UE needs to enter the RRC_CONNECTED state for discovery information announcement.
  • An eNB may configure that UE has to use a type 1 resource pool for discovery information announcement or has to use a type 2 resource through an RRC signal in relation to UE in the RRC_CONNECTED state.
  • the present invention proposes a method and a device for transmitting downlink control information (DCI) in a wireless communication system.
  • DCI downlink control information
  • a UE refers to a terminal of a user.
  • network equipment such as a BS
  • the network equipment may also be regarded as a UE.
  • a PSBCH represents a physical sidelink broadcast channel.
  • a PSCCH represents a physical sidelink control channel.
  • a PSDCH represents a physical sidelink discovery channel.
  • a PSSCH represents a physical sidelink shared channel.
  • An SLSS represents a sidelink synchronization signal.
  • An SLSS includes a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS).
  • a sidelink refers to a UE-to-UE interface for D2D communication and D2D discovery.
  • a sidelink corresponds to a PC5 interface.
  • D2D communication may be referred to as sidelink communication or simply as communication
  • D2D discovery may be referred to as sidelink discovery or simply as discovery.
  • a D2D UE refers to a UE that performs a D2D operation, and a D2D operation includes at least one of D2D communication and D2D discovery.
  • the present invention will be described based on 3GPP LTE/LTE-A systems.
  • the present invention may also be applicable to systems other than the 3GPP LTE/LTE-A systems.
  • V2X communication refers to a communication mode of exchanging or sharing information, such as traffic conditions, through communication with road infrastructure and other vehicles while driving.
  • V2X may include vehicle-to-vehicle (V2V), which refers to communication between vehicles, vehicle-to-pedestrian (V2P), which refers to communication between UEs carried by a vehicle and an individual person, and vehicle-to-infrastructure/network (V2I/N), which refers to communication between a vehicle and a roadside unit (RSU) and a network.
  • V2V vehicle-to-everything
  • V2X communication refers to a communication mode of exchanging or sharing information, such as traffic conditions, through communication with road infrastructure and other vehicles while driving.
  • V2X may include vehicle-to-vehicle (V2V), which refers to communication between vehicles, vehicle-to-pedestrian (V2P), which refers to communication between UEs carried by a vehicle and an individual person, and vehicle-to-infrastructure
  • V2V communication refers to communication between a UE installed in a first vehicle and a UE installed in a second vehicle.
  • FIG. 6 illustrates scenarios in which V2V communication is performed.
  • V2V communication may be performed in: 1) scenario 1 where only a V2V operation based on PC5, which is an interface between UEs, is supported; 2) scenario 2 where only a V2V operation based on Uu, which is an interface between a BS (eNodeB) and a UE, is supported; and 3) scenario 3 where a V2V operation is supported using both PC5 and Uu.
  • scenario 1 where only a V2V operation based on PC5, which is an interface between UEs, is supported
  • scenario 2 where only a V2V operation based on Uu, which is an interface between a BS (eNodeB) and a UE, is supported
  • scenario 3 where a V2V operation is supported using both PC5 and Uu.
  • FIG. 7 illustrates a signaling process for V2V communication between UEs and a BS.
  • a BS transmits a DCI format to UE #1 (S70).
  • the DCI format may be a DCI format for mode 1, that is, a mode in which the BS schedules a resource for V2V communication.
  • UE #1 may perform sidelink communication, for example, V2V communication, with UE #2 using the resource scheduled according to the DCI format (S71).
  • FIG. 8 illustrates a signaling process for V2V communication between UEs.
  • UE #1 transmits a sidelink control information (SCI) format for V2V communication (S80). Subsequently, UE #1 may perform V2V communication with UE #2 on the basis of the SCI format (S81).
  • SCI sidelink control information
  • a scheduling assignment (SA) and data associated with the SA are transmitted in the same subframe, a resource indicated by decoding the SA or reserved or a resource having a PSSCH RSRP of a threshold value or greater among resources for the associated data may be excluded.
  • PSSCH RSRP in the resources for the associated data may be defined as the linear average of power distribution of resource elements carrying a DM RS associated with an associated PSSCH in PRBs indicated by the PSCCH.
  • a reference point for PSSCH RSRP may be an antenna connector of a UE.
  • a UE may perform the following operations.
  • Resource selection/reselection may be triggered for the UE in a subframe (hereinafter, also referred to as a TTI) #n. Then, the UE may sense from subframe #n-a to subframe #n-b (a>b>0, where a and b are an integer) and may select/reselect a resource for transmission of a V2V message based on the sensing result.
  • Values a and b may be set commonly to UEs or may be set independently for UEs.
  • the UE may consider SAs of other UEs in an interval from sub frame #n-a to subframe #n-b.
  • the SA may be associated with data transmission in the interval from subframe #n-a to subframe # n-b and may be transmitted before subframe #n-a.
  • the UE may exclude subframes #(m+100 ⁇ k) from resource selection/reselection.
  • the UE may not perform but skip a sensing operation in subframes that are used for the UE to transmit a signal.
  • the UE After performing sensing, the UE selects a time/frequency resource for a PSSCH, that is, a sidelink data channel.
  • a first UE may assume that the same frequency resource is also reserved in subframe #m+d+P ⁇ i by a second UE transmitting the SA.
  • P may be a fixed value of 100, and i may be selected from among [0, 1, ..., 10] and may be carrier-specificcally limited. Alternatively, i may be set to 0, which means that it is not intended to reserve a frequency resource. The value of i may be signaled via a 4-bit field in the SA.
  • the UE may exclude resource X.
  • I may be a value for i signaled via the SA.
  • the UE may increase a threshold (e.g., 3 dB) and may then exclude a resource again, in which excluding resources may be performed until the remaining resources are greater than 20% of the total resources in the selected window.
  • a threshold e.g. 3 dB
  • the measurement period of the PSSCH resource may be P.
  • the measurement may be performed only on resources remaining via the foregoing process.
  • the UE may maintain a current resource with a probability of p and may reset the counter. That is, a resource may be reselected with a probability of 1-p.
  • a carrier-specific parameter p may be preset and may be set in a range of [0, 0.2, 0.4, 0.6, 0.8].
  • the UE measures the remaining PSSCH resources excluding the particular resource, ranks the resources on the basis of the total reception energy, and then selects a subset thereof.
  • the subset may be a set of candidate resources having the lowest reception energy.
  • the size of the subset may be 20% of the total resources in the selected window.
  • the UE may randomly select one resource from the subset.
  • the UE may select M consecutive subchannels, and the average of energy measured in each subchannel may be an energy measurement of each resource.
  • One resource may be selected using a mechanism defined for a case where a transmission block is transmitted in one subframe. Alternatively, when a particular condition is satisfied, it is possible to randomly select another resource.
  • the UE may not transmit a transmission block without an SA. That is, an SA also needs to be transmitted in TB transmission or retransmission.
  • the UE When a resource is set such that an SA and data can be transmitted in the same subframe, the UE does not expect to combine the resource with a PSCCH transmitted in another subframe.
  • a resource pool may include one subchannel or a plurality of subchannels in the frequency domain.
  • a subchannel may include consecutive resource blocks in the same subframe.
  • the size of a subchannel that is, the number of resource blocks included the subchannel, may be one of ⁇ 5, 6, 10, 15, 20, 25, 50, 75, 100 ⁇ and may be predetermined or may be set by a BS.
  • Each subchannel may include one SA candidate resource.
  • the SA candidate resource may also be used for data transmission.
  • the number of subchannels in an associated data resource pool and the number of SA candidate resources in an SA resource pool may be the same.
  • the SA candidate resources in the SA resource pool and the subchannels in the data resource pool may be associated 1:1.
  • a PSSCH resource pool may include one subchannel or a plurality of subchannels in the frequency domain.
  • a subchannel may include consecutive resource blocks in the same subframe and may be predetermined or may be set by the BS.
  • the maximum number of subchannels in one subframe may be 20.
  • the minimum size (the number of resource blocks) of a subchannel may be four.
  • the PSCCH resource pool may include consecutive PRBs.
  • the energy sensing granularity of a PSSCH may be the size of a subchannel.
  • the UE may always select an integer number of contiguous subchannels for transmission.
  • the UE does not attempt to decode more than 100 resource blocks in one subframe and does not attempt to decode more than 10 PSCCHs.
  • the SA resource pool and the data resource pool may overlap.
  • the resource pool for V2V may be defined by a bitmap mapped to subframes other than a subframe for transmitting an SLSS.
  • the length of the bitmap may be any one of 15, 20, and 100.
  • the bitmap may indicate/define a subframe in which SA/data transmission/reception for V2V is allowed.
  • the UE When resource reselection is triggered, the UE reselects resources for all transmissions corresponding to a transmission block.
  • An SA schedules only transmission corresponding to one transmission block.
  • mode 1 is a mode in which a BS schedules a resource for V2V communication
  • mode 2 is a mode in which a UE selects a resource for V2V communication from a resource pool set by a network or predetermined.
  • SCI may be control information transmitted by a UE in a sidelink, may be 48 bits in total, and may include the following fields.
  • Priority 3 bits, resource reservation: 4 bits, MCS: 5 bits, CRC: 16 bits, retransmission index: 1 bit, time gap between initial transmission and retransmission: 4 bits (Here, this field has one value of 0 to 15, in which 0 denotes no retransmission of a related transmission block), frequency resource location (FRA_INRETX) for initial transmission and retransmission: 8 bits, reserved bits: 7 bits.
  • RV 0 and 2 are sequentially used for initial transmission and retransmission.
  • DCI transmitted by a BS for dynamic scheduling for a sidelink may include the following fields.
  • CIF 3 bits (an interpretation of the CIF may be preset and may be different from that of a CIF for uplink and downlink), lowest (smallest) index of subchannel assigned for initial transmission (PSCCH_RA): 5 bits, SA content: i) time gap between initial transmission and retransmission (TGAP_INRETX: 4 bits), ii) frequency resource location for initial transmission and retransmission (FRA_INRETX: 8 bits).
  • the length of the DCI may be the same as DCI format 0, and an RNTI other than a C-RNTI/SPS-RNTI may be used.
  • a time location for initial transmission may be the first subframe included in a resource pool of a V2V carrier and may be a subframe 4 ms after a subframe in which the DCI is transmitted.
  • the payload size of the MODI1_DYN DCI format When the payload size of the MODI1_DYN DCI format is matched to that of existing DCI format 0, the payload size of the MODI1_DYN DCI format (e.g., 20 bits) may become greater than that of DCI format 0 (e.g., 19 bits (1.4 MHz)) at a particular system bandwidth (e.g., 1.4 MHz).
  • DCI format 0 e.g., 19 bits (1.4 MHz)
  • system bandwidth e.g., 1.4 MHz
  • a V2V (PSSCH (/PSCCH)) resource pool may be configured by (information) signaling (A) the total number of subchannels included in the V2V resource pool in one subframe, and/or (B) the number of resource blocks included in a (single) subchannel (subchannel size), and/or (C) the starting location of a subchannel (RB) in the frequency domain, and/or (D) the location of a subframe where the V2V resource pool is set (e.g., a predefined length (e.g., a bitmap format of 16, 20, or 100)) (and/or (E) the starting location of a subchannel (RB) (in the frequency domain) of a (E)PSCCH resource pool (this information may be valid (present) only when a PSCCH and a (linked) PSSCH are not located on contiguous resource blocks in the same sub frame)).
  • A the total number of subchannels included in the V2V resource pool in one subframe
  • B the number of resource blocks
  • DCI format 5A the size of FRA_INRETX (and/or PSCCH_RA) included in DCI format 5A can be changed depending on the total number of subchannels (TSUBNUM_SF) included in a V2V resource pool (in one subframe) set (signaled) in advance.
  • DCI format 5A is a DCI format used for PSCCH scheduling and may also include fields used for PSSCH scheduling.
  • FIG. 9 illustrates a method for determining the payload size of DCI format 5A according to proposed method #1.
  • a subchannel may include a plurality of contiguous resource blocks in the same subframe.
  • the BS may adjust the number of resource blocks included in a subchannel, thereby adjusting the size of a resource allocation (RA) field of DCI format 5A. Accordingly, it is possible to prevent the total payload size of DCI format 5A from being greater than that of DCI format 0.
  • RA resource allocation
  • the size of FRA_INRETX (frequency resource location field for initial transmission and retransmission) (and/or PSCCH_RA (lowest (smallest) index field of a subchannel assigned for initial transmission)) included in DCI format 5A may be CEILING(LOG 2 (K ⁇ (K+1)/2)) (and/or "CEILING (LOG 2 (K))").
  • CEILING(X) is a function for deriving a minimum integer value that is equal to or greater than X.
  • the size of FRA_INRETX may be six bits (and/or four bits).
  • TSUBNUM_SF number of subchannels
  • the payload size e.g., 20 bits
  • the payload size e.g. 19 bits
  • FRA_INRETX and/or PSCCH_RA
  • the size of FRA_INRETX can be changed according to the FLOOR value (the number of resource blocks included in a system bandwidth/(one) subchannel (subchannel size)) (which is referred to as MAX_SUBVAL).
  • FLOOR(X) is a function for deriving a maximum integer value that is less than or equal to X.
  • the size of FRA_INRETX (and/or PSCCH_RA) may be changed to CEILING(LOG 2 (K ⁇ (K+1)/2)) (and/or CEILING (LOG 2 (K))).
  • a MODE1_DYN operation-related DCI format (M1DYN_DCI) may be managed according to (some of) the following rules.
  • (some of) the rules may also be applied to a mode-1 V2V SPS operation-related DCI format.
  • CCS M1DYN_DCI for a particular frequency (cell) (referred to as SD_CELL) is transmitted on a search space (SS) of (another) particular frequency (cell) (referred to as SC_CELL) that is preset (/signaled)
  • the payload size of CCS M1DYN_DCI can be matched to the (payload) size (SC_FMOLN) of a preset (/signaled) DCI format (e.g., DCI format 0) based on an SC_CELL-related parameter (not to the (payload) size (SD_FMOLN) of a preset (/signaled) DCI format (e.g., DCI format 0) based on an SD_CELL-related parameter (e.g., system (uplink) bandwidth)).
  • the search space of the (other) particular frequency (cell) (SC_CELL), on which SD_CELL-related M1DYN_DCI is transmitted may be construed as a search space that is located on (another) (preset/signaled) particular frequency (cell) for cross-carrier scheduling of SC_CELL and transmits cross-carrier scheduling information related to the (other) particular frequency (cell) (SC_CELL) SS.
  • FIG. 10 illustrate a size fitting method for DCI format 1A according to the prior art.
  • a first search space 121 for DCI to schedule secondary cell #1 (Scell #1) and a second search space 122 for DCI to schedule secondary cell #2 (Scell #2) may be determined within a PDCCH region for a primary cell.
  • a carrier indication field (CIF) for Scell #1 is N and a CIF for Scell #2 is M, where N and M may be different integers.
  • DCI format 1A for Scell #1 in the first search space 121 is size-fitted to the size of DCI format 0 for Scell #1.
  • DCI format 1A for Scell #2 in the second search space 122 is size-fitted to the size of DCI format 0 for Scell #2. That is, when the number of information bits of DCI format 1A mapped to a given search space is less than that of DCI format 0 that is mapped to the search space and schedules the same serving cell, zero padding is performed so that DCI format 1A has the same size as that of DCI format 0.
  • FIG. 11 conceptually illustrates a size fitting method for DCI format 5A according to proposed method #3.
  • DCI format 0 for Scell #1 and DCI format 5A for a V2V carrier may share the same search space.
  • the search spaces may be set to be common.
  • DCI format 5A for the V2V carrier undergoes zero padding (i.e. size fitting) to match the size of DCI format 0 that shares the same search space regardless of whether the formats(the DCI format 5A and the DCI format 0) are for the same serving cell. That is, even though the same search space is shared with DCI format 0 for a different cell, the size of DCI format 5A for the V2V carrier is matched to the size of DCI format 0 for the different cell.
  • FIG. 12 illustrates a generalized size fitting method for a DCI format according to proposed method #3.
  • a BS may determine the size of a first DCI format (S20), may fit the size of a second DCI format (zero padding) to the size of the first DCI format (S21), and may transmit the second DCI format to a UE.
  • the first DCI format and the second DCI format may be DCI formats that share the same search space regardless of whether the formats are for the same serving cell. That is, the first DCI format and the second DCI format may be DCI formats for scheduling physical channels of different serving cells.
  • the first DCI format and the second DCI format may have the same CIF value and may thus share the same search space. That is, the first DCI format and the second DCI format may be mapped to the same search space.
  • FIG. 13 illustrates a specific example of applying FIG. 12 .
  • a BS may determine the size of DCI format 0 (S200), may fit the size of DCI format 5A (zero padding) to the size of DCI format 0 (S210), and may transmit DCI format 5A to a UE.
  • DCI format 0 is a DCI format used to schedule a physical uplink shared channel (PUSCH)
  • DCI format 5A is a DCI format used to schedule a physical sidelink control channel (PSCCH) and may also include fields for PSSCH scheduling.
  • PUSCH physical uplink shared channel
  • PSCCH physical sidelink control channel
  • the UE may (always) assume (/expect) that the (payload) size of CCS M1DYN_DCI before zero padding on the SC_CELL SS is not greater than SC_FMOLN (e.g., DCI format 0). Further/alternatively, it may be interpreted that a network (always) configures (/signals) (or guarantees (by adjusting the number of subchannels included in a V2X resource pool)) the (payload) size of CCS M1DYN_DCI before zero padding on the SC_CELL SS not to be greater than SC_FMOLN.
  • SC_FMOLN e.g., DCI format 0
  • the UE may retrieve DCI format 5A assuming that the size of DCI format 5A is equal to the size of DCI format 0 sharing the search space with DCI format 5A.
  • FIG. 14 illustrates an operation method of a UE in a search space.
  • the UE may determine the size of DCI format 0 in a given search space (S400) and may not expect (attempt) to detect DCI format 5A having a size larger than the size of DCI format 0 in the search space (S410).
  • CCS M1DYN_DCI(s) related to a plurality of preset (/signaled) SD_CELL(s) transmitted on an SC_CELL search space may be considered to be transmitted, regardless of the value of each CIF, in a SC_CELL-related UE-specific search space (USS) (and/or common search space (CSS)) (or transmitted in an (individual) SD_CELL-related USS (and/or CSS) (on SC_CELL) derived by a search space equation having a CIF value as an input parameter (e.g., when the SD_CELL-related CCS M1DYN_DCI is transmitted on the SC_CELL SS, it may be considered that SD_CELL and SC_CELL have the same CIF value)).
  • USS SC_CELL-related UE-specific search space
  • CSS common search space
  • a CIF e.g., 3 bits
  • a CIF e.g., 3 bits
  • a CIF e.g., 3 bits
  • the payload size of M1DYN_DCI transmitted in a frequency (/cell) (SF_CELL) to which a self-scheduling (SFS) MODE1_DYN operation is applied may be matched to the (payload) size of a DCI format (e.g., DCI FORMAT 0) preset (/signaled) based on an SF_CELL-related parameter (e.g., system (uplink) bandwidth) in the absence of a CIF (or in the case where a CCS operation is not configured).
  • a DCI format e.g., DCI FORMAT 0
  • an SF_CELL-related parameter e.g., system (uplink) bandwidth
  • ((Preset (/signaled)) (a plurality of) SD_CELL(s)-related) CCS M1DYN_DCI(s) may be transmitted only in a particular preset (/signaled) frequency (/cell) (e.g., primary frequency (/cell) or secondary frequency (/cell)) (USS (and/or CSS)) and/or a particular preset (/signaled) frequency (/cell)-related CIF value may be (always) set to 0 (or a particular preset (/signaled) value).
  • a particular preset (/signaled) frequency (/cell) e.g., primary frequency (/cell) or secondary frequency (/cell)
  • USS and/or CSS
  • a particular preset (/signaled) frequency (/cell)-related CIF value may be (always) set to 0 (or a particular preset (/signaled) value).
  • a linkage between a CIF value for a frequency (/cell) in which V2X communication (/operation) is performed and a CIF value for a frequency (/cell) in which WAN (UL) communication (/operation) is performed may be set through predefined higher (/physical)-layer signaling.
  • V2X DCI related to the frequency (/cell) where V2X communication (/operation) is performed which is related to the set linkage
  • V2X communication (/operation) which is related to the set linkage
  • WAN (UL) DCI related to the frequency (/cell) where WAN (UL) communication (/operation) is performed which is related to the set linkage
  • WAN (UL) DCI related to the frequency (/cell) where WAN (UL) communication (/operation) is performed which is related to the set linkage, may be blind-detected in an SS related to the frequency (/cell) where V2V communication (/operation) is performed.
  • mode-1 sidelink dynamic scheduling DCI MODE1_SLDYNDCI
  • mode-1 sidelink semi-persistent scheduling DCI MODE1_SLSPSDCI
  • mode-1 uplink semi-persistent scheduling DCI MODE1_ULSPSDCI
  • a DCIs-related size-fitting operation may be performed according to (some of) the following rules.
  • (some of) the following rules may be limitedly applied only when a mode-1 sidelink dynamic scheduling (MODE1_SLDYN) operation and/or a mode-1 sidelink semi-persistent scheduling (MODE1_SLSPS) operation are simultaneously set (/signaled) for one V2X UE with respect to one particular carrier/frequency.
  • MODE1_SLDYN mode-1 sidelink dynamic scheduling
  • MODE1_SLSPS mode-1 sidelink semi-persistent scheduling
  • SCH_CARRIER a carrier (/frequency) where a MODE1_SLDYN operation and/or a MODE1_SLSPS operation are performed is referred to as "V2X_CARRIER", and a carrier (/frequency) where related cross-carrier scheduling (CCS) DCI is transmitted is referred to as "SCH_CARRIER”.
  • SCH_CARRIER may also be referred to as, for example, "WAN (UL) carrier (/frequency)” (e.g., primary cell (/secondary cell)).
  • V2X_CARRIER and SCH_CARRIER may be different carriers in cross-carrier scheduling or may be the same carrier in self-scheduling (SFS).
  • FSS self-scheduling
  • carrier may be (extended to) interpreted as “cell” and/or “component carrier”.
  • the mode-1 sidelink dynamic scheduling DCI (MODE1_SLDYNDCI) may include the following fields:
  • the mode-1 sidelink semi-persistent scheduling DCI may include the following fields.
  • MODE1_SLSPSDCI may further include the following two fields in addition to fields included in existing dynamic scheduling DCI (e.g., DCI 5A): 1) sidelink SPS configuration index which occupies 3 bits; and 2) activation/release indication which occupies 1 bit.
  • the activation/release indication may indicate activation/release of a sidelink SPS.
  • a RNTI (SL SPS RNTI) different from a sidelink dynamic scheduling RNTI may be defined.
  • MODE1_SLSPSDCI may include one SPS configuration index.
  • the mode-1 uplink semi-persistent scheduling DCI may reuse a particular field included in DCI format 0, for example, a cyclic shift DM RS (3 bits) field or a TPC command (2 bits) field, to indicate a V2X UL SPS configuration index.
  • the mode-1 uplink semi-persistent scheduling DCI may include one SPS configuration index.
  • All or only (particular) predefined or signaled DCI (e.g., MODE1_SLDYNDCI)) among MODE1_SLDYNDCI, MODE1_SLSPSDCI, and DCI FORMAT 0 may be size-fitte to the largest payload size (e.g., the size of MODE1_SLSPSDCI or DCI FORMAT 0) among the payload sizes of the above three pices of DCI.
  • the payload size of (only) MODE1_SLDYNDCI may be size-fitted to that of MODE1_SLSPSDCI.
  • the payload size of (only) MODE1_SLDYNDCI may be size-fitted to that of MODE1_SLSPSDCI.
  • the payload size of all of MODE1_SLDYNDCI and/or MODE1_SLSPSDCI and/or DCI FORMAT 0 may be size-fitted to the payload size of particular preset (/signaled) DCI format (e.g., MODE1_SLSPSDCI or DCI FORMAT 0).
  • the search space in the scheduling carrier (SCH_CARRIER) in which the sidelink dynamic scheduling DCI (MODE1_SLDYNDCI) and/or the sidelink semi-persistent scheduling DCI (MODE1_SLSPSDCI) are transmitted is derived using a V2X CARRIER-related CIF value.
  • DCI FORMAT 0 may be construed as a particular preset (/signaled) reference DCI format for size fitting related to MODE1_SLDYNDCI and/or MODE1_SLSPSDCI transmitted on the same search space.
  • a reference DCI format e.g., DCI format 0
  • a reference DCI format is not transmitted (or, conversely, a reference DCI format is not transmitted (/present) in a search space in SCH_CARRIER where MODE1_SLDYNDCI and/or MODE1_SLSPSDCI are transmitted
  • at least one of the following illustrative methods may be employed.
  • the payload size of MODE1_SLDYNDCI may be size-fitted to a relatively large size of MODE1_SLSPSDCI.
  • the payload size of MODE1_SLSPSDCI may be greater by four bits than that of MODE1_SLDYNDCI.
  • FIG. 15 illustrate a DCI size fitting method according to example #4-4.
  • a BS may determine the size of the sidelink semi-persistent scheduling DCI (S300) and may fit the size of the sidelink dynamic scheduling DCI to the size of the sidelink semi-persistent scheduling DCI (S310).
  • the size of the sidelink dynamic scheduling DCI is fitted to the size of the sidelink semi-persistent scheduling DCI. According to this method, it is possible to reduce the number of times a UE performs blind decoding and to reduce complexity.
  • V2X_CARRIER As a virtual WAN (UL) communication carrier (/frequency), the payload size (VIR_DCIZSIZE) of DCI format 0 (or MODE1_SLSPSDCI) is derived on the basis of at least one of the payload size of DCI format 0 based on a V2X_CARRIER (system) bandwidth, the payload size of DCI format 0 based on a SCH_CARRIER (system) bandwidth (where WAN (UL(/DL)) communication is performed), the preset (/allowed) greatest (system) bandwidth (e.g., 20 MHz), and a nominal system bandwidth, the maximum number of subchannels (e.g., 20, or nominal subchannel number).
  • V2X_CARRIER virtual WAN (UL) communication carrier
  • the payload size (VIR_DCIZSIZE) of DCI format 0 is derived on the basis of at least one of the payload size of DCI format 0 based on a V2X_CARRIER (
  • the payload size of (all of) MODE1_SLDYNDCI and/or MODE1_SLSPSDCI may be size-fitted to VIR_DCIZSIZE and/or (B) may be size-fitted to the largest payload size among the sizes of MODE1_SLDYNDCI and/or the size of MODE1_SLSPSDCI and/or VIR_DCIZSIZE.
  • the payload size of (all of) MODE1_SLDYNDCI and/or MODE1_SLSPSDCI may be size-fitted to the payload size of a particular preset (/signaled) DCI format.
  • duplex mode e.g., TDD/FDD
  • a reference DCI (payload) size e.g., VIR_DCIZSIZE
  • A a reference DCI (payload) size
  • B a preset (/signaled) nominal duplex mode
  • the payload size of DCI format 1A when the payload size of DCI format 0 should be increased (for size fitting), the payload size of DCI format 1A (transmitted in the same SS) may be size-fit to the increased payload size of DCI format 0.
  • an additional field indicating information on the time location of a scheduled V2X subframe may be defined in MODE1_SLDYNDCI and/or MODE1_SLSPSDCI so that all subframes in a preset (/signaled) V2X resource pool on V2X_CARRIER are (cross-carrier-) scheduled (from a (TDD) UU carrier).
  • This field may be, for example, 2 bits and may be referred to as TL_FIELD.
  • a UU carrier refers to a carrier used between a BS and a UE.
  • TL_FIELD may be fixed to a preset (/signaled) value (K_SIZE) (regardless of the TDD UL-DL configuration of the (TDD) UU carrier).
  • K_SIZE preset (/signaled) value
  • the size of actually used bits in K_SIZE may be differently (or independently) set (/signaled) for each TDD UL-DL configuration of a (TDD) UU carrier.
  • bits actually not used in K_SIZE may be designated to be a preset (/signaled) value (e.g., 0) or may be used as a virtual CRC). Further/alternatively, bits actually not used in K_SIZE may be designated by a V2X UE to be a random value in order to obtain additional randomization effect of a PSSCH DM-RS sequence (/cyclic shift) (derived with a PSCCH CRC value).
  • scheduling information-based initial transmission time may be the closest (K+1)th V2X subframe belonging to the (preset (/signaled)) V2X resource pool after 4 ms (four subframes) from the reception time (SF#N) of (cross-carrier scheduling) MODE1_SLDYNDCI and/or MODE1_SLSPSDCI.
  • the TL_FIELD size (and/or actually used bits in K_SIZE) may be differently set (/signaled) depending on the TDD UL-DL configuration of a (TDD) UU carrier (and/or (V2X transmission-related) scheduling type (e.g., self-carrier scheduling and cross-carrier scheduling)).
  • TDD TDD UL-DL configuration
  • V2X transmission-related scheduling type e.g., self-carrier scheduling and cross-carrier scheduling
  • V2X UL SPS DCI may be extended to V2X UL SPS DCI in order to increase the degree of freedom in designating (/scheduling) V2X UL SPS activation (/release) time.
  • V2X UL activation (/release) application time may be the closest (K+1)th UL subframe after 4 ms (four subframes) from the reception time (SF#N) of the (cross-carrier scheduling) V2X UL activation (/release) SPS DCI.
  • FIG. 16 illustrates sidelink cross-carrier scheduling timing.
  • a Uu carrier is set to TDD UL-DL configuration #0.
  • subframe #n downlink subframe or special subframe
  • subframe # n+4 of a PC5 carrier it is impossible to schedule all subframes of the PC5 carrier. Therefore, in TDD, a field to indicate the time location of a V2V subframe scheduled may be added.
  • examples of (A) the field configuration of a mode-1 sidelink dynamic scheduling DCI format (SLDYN_DCI) (e.g., DCI format 5A) and/or (B) the field configuration of a mode-1 sidelink SPS DCI format (SLSPS_DCI) and/or (C) the field configuration of an SCI format (SCI_FMT) (e.g., SCI format 1) will be described.
  • a UE When a mode-1 sidelink SPS operation is performed, a UE may be allowed to set the value of a resource reservation field (which may be a field indicating a resource reservation period value or a V2X message transmission period value for a V2X transmission UE) of an SCI format according to (some of) the following rules.
  • a resource reservation field which may be a field indicating a resource reservation period value or a V2X message transmission period value for a V2X transmission UE
  • DCI format 5A (SLDYN_DCI) is used for PSCCH scheduling may include the following information or fields:
  • carrier indication field (3 bits); 2) lowest index of subchannel allocation (which may occupy ceil(log 2 (N SL subchannel )) bits); 3) SCI format 1 fields; 4) sidelink index (2 bits, which may be present only for cases with TDD operation with UL-DL configuration 0-6).
  • the SCI format 1 fields may include: 1) a field of frequency resource location for initial transmission and retransmission; and 2) a field of time gap between initial transmission and retransmission.
  • DCI format 5A When the number of information bits in DCI format 5A mapped to a given search space is less than the payload size of DCI format 0 that is mapped to the same search space, zeros are appended to DCI format 5A until DCI format 5A has the same size as that of DCI format 0 (including padding bits if present).
  • the sidelink SPS DCI may further include fields of: 1) sidelink SPS configuration index (3 bits); and 2) activation/release indication (1 bit) in addition to the fields included in the dynamic scheduling DCI (i.e., DCI format 5A).
  • SCI format 1 (SCI_FMT) is used for PSSCH scheduling and may include the following information bits or fields:
  • priority (3 bits); 2) resource reservation (4 bits); 3) frequency resource location for initial transmission and retransmission (which may occupy ceil(log 2 (N SL subchannel (N SL subchannel + 1)/2) bits); 4) time gap between initial transmission and retransmission (4 bits); 5) modulation and coding scheme (5 bits); and 6) retransmission index (1 bit). Meanwhile, reserved information bits are added until the size of SCI format 1 is equal to 32 bits.
  • V2X transmission UE#K may be allowed to set the value of a resource reservation field in SCI_FMT (A) to an SLSPSCON#X-related period value ((RRC-) signaled in advance from the BS) and/or (B) to a value (preset (/signaled) or configured by the UE), instead of a (carrier-specific candidate) value configurable as a resource reservation field value, thus notifying another V2X UE that the UE transmits a V2X message based on mode 1 (and/or mode 1 sidelink SPS), and/or (C)
  • the rules (B) and/or (C) may be (limitedly) applied only when a resource pool related to mode 1 (and/or mode 1 sidelink SPS) is set (/signaled) to be different from that for another mode (e.g., mode 2).
  • the illustrative proposed methods described above may also be included as methods for implementing the present invention and thus may be regarded as a kind of proposed schemes.
  • the proposed methods described above may be implemented independently, but some of the proposed methods may be combined (or merged) for implementation.
  • D2D communication refers to communication between one UE and another UE via a direct wireless channel.
  • a UE may be a terminal of a user.
  • network equipment such as a BS, transmits or receives a signal according to the communication mode between UEs, the network equipment may also be regarded as a UE.
  • the proposed methods of the present invention may be applied only to a mode-2 V2X operation (and/or mode-1 (sidelink dynamic scheduling and/or sidelink SPS and/or uplink SPS) V2X operation).
  • the proposed methods of the present invention may be limitedly applied only when a PSCCH and a (linked) PSSCH are not located (or are located) in contiguous resource blocks in the same subframe.
  • the proposed methods of the present invention may also be applied not only to a V2V mode-1 (/mode-2) dynamic scheduling operation but also to a V2V mode-1 (/mode-2) semi-static scheduling (SPS) operation (and/or a V2X mode-1 (/mode-2) dynamic scheduling operation and/or a V2X mode-1 (/mode-2) SPS operation).
  • mode 1 (or “mode 2”) may be interpreted as (/replaced with) "mode 3" (or “mode 4") related to V2X communication.
  • the proposed methods of the present invention may be applied to DCI and/or SCI associated with V2X communication.
  • FIG. 17 is a block diagram illustrating a device to implement an embodiment of the present invention.
  • the device 1100 includes a processor 1110, a memory 1120, and a radio frequency (RF) unit 1130.
  • the device 1100 may be a base station, a relay station, or a UE.
  • the processor 1110 performs a proposed function, process and/or method.
  • the RF unit 1130 is connected to the processor 1110 and transmits and receives radio signals.
  • the memory 1120 may store information necessary for driving the processor 1110 and/or the RF unit 1130.
  • the processor may comprise an application-specific integrated circuit (ASIC), other chipset, logic circuitry and/or data processing device.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and/or other storage devices.
  • the RF unit may include a baseband circuit for processing the radio signal.

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US201662381634P 2016-08-31 2016-08-31
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US201662384163P 2016-09-06 2016-09-06
US201662416714P 2016-11-03 2016-11-03
US201662420732P 2016-11-11 2016-11-11
US201762450580P 2017-01-26 2017-01-26
PCT/KR2017/009510 WO2018044080A1 (ko) 2016-08-30 2017-08-30 무선 통신 시스템에서 하향링크 제어 정보 전송 방법 및 상기 방법을 이용하는 장치

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JP2019535162A (ja) 2019-12-05
KR102104593B1 (ko) 2020-04-24
US11336390B2 (en) 2022-05-17
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JP6756038B2 (ja) 2020-09-16
CN109644486B (zh) 2022-09-27
KR20190026922A (ko) 2019-03-13
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US20190190643A1 (en) 2019-06-20
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